package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;


import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result signCount() {
        // 1.获取当前登录用户
        UserDTO user = UserHolder.getUser();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + user.getId() + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        // 5.获取本月截止今天为止的所有签到记录，返回的是一个十进制的数字
        List<Long> results = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (results == null || results.isEmpty()){
            return Result.ok();
        }
        Long num = results.get(0);
        if (num == null || num == 0){
            return Result.ok();
        }
        // 6.循环遍历
        int count = 0;
        while (true) {
            // 6.1让这个数字与1做与运算，得到数字的最后一个bit位,判断这个bit位是否为0
            // 1011&0001 ->1与其他进行与运算，只有都为1才为1
            if ((num & 1) == 0) {
                // 如果为0，说明未签到，结束
                break;
            }else {
                // 如果不为0，说明已签到，计数器+1
                count++;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit循环
            num >>>= 1;
        }
        return Result.ok(count);
    }

    @Override
    public Result sign() {
        // 1.获取当前登录用户
        UserDTO user = UserHolder.getUser();
        // 2.获取日期
        LocalDateTime now = LocalDateTime.now();
        // 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + user.getId() + keySuffix;
        // 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth() - 1;
        // 5.写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth,true);
        return Result.ok();
    }

    /**
     * 发送验证码
     * @param phone 手机号
     * @return
     */
    @Override
    public Result sendCode(String phone) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis 设置过期时间为两分钟
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5.发送验证码
        log.debug("发送验证码成功，验证码：{}",code);
        return Result.ok(code);
    }

    /**
     * 登录功能
     * @param loginForm 登录参数，包含手机号、验证码；或者手机号、密码
     * @return 登录结果
     */
    @Override
    public Result login(LoginFormDTO loginForm) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            //2.不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        //2. 从redis中获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());
        if(cacheCode == null ||!cacheCode.equals(loginForm.getCode())){
            //3.不一致，返回错误
            return Result.fail("验证码错误");
        }

        // 4.一致，根据手机号查询用户
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("phone",loginForm.getPhone());
        User user = getOne(queryWrapper);

        //5.不存在，创建新用户并保存
        if (user == null){
            user = creatUserWithPhone(loginForm.getPhone());
        }

        //6.保存用户信息到redis中
        //6.1 随机生成token，作为登录令牌
        String token = UUID.randomUUID(true).toString();
        //6.2 将User对象转换为HashMap
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue)-> fieldValue.toString())
        );
        //6.3 存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        //6.4 设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.5 返回token
        return Result.ok(token);
    }

    private User creatUserWithPhone(String phone){
        User user = new User();
        user.setPhone(phone);
        user.setNickName("user_" + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
